@ 8:50, Police player swung with a couple Commandramon to close the game, but couldnt do this as his own Takumi would have cost him memory and passed the turn. He was at 1 so he could not have swung with both rookies
@ 6:00 brigade cannot activate its when digivolving effect due to venusmon effect the previous turn. just so you were aware venus effect is a blanket effect that will effect all digimon that enter the board
that Digimon was Ryuudamon and was immune to Opponent's effects until the end of their turn, so at the end you pull of the tamer and at the start of your turn the Minus DP is still happening but your protection is over, so it gets deleted.
